Stir together oats, flour, cinnamon, nutmeg, salt, and baking powder.
Stir in mashed banana, peanut butter, maple syrup, and egg.
Fold in chocolate chips.
Using a ¼ cup measuring cup, scoop onto a baking sheet.
Flatten the tops and bake at 350° for 15-20 minutes, until set and golden around the edges.
Cool completely before removing from the baking sheet.
Store in an airtight container.
Notes
These can be kept in an airtight container at room temperature for several days. If you prefer to freeze them, wrap individually in plastic wrap and place in a ziplock bag. Thaw on the counter overnight.